Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 446
B221A-HEATED SEAT MODULE INTERNAL
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:Ignition on.
•
Set Condition:This code is set immediately if the Heated Seat Module internal self test fails.
Possible Causes
HEATED SEAT MODULE
Diagnostic Test
1.
VERIFY THAT DTC B221A-HEATED SEAT MODULE INTERNAL IS ACTIVE
With the scan tool, record and erase DTC’s
Cycle the ignition switch off then back on.
With the scan tool, read DTC’s.
Does the DTC B221A-HEATED SEAT MODULE INTERNAL reset?
Yes
>> Replace the Heated Seat Module.
Perform BODY VERIFICATION TEST – VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
No
>> The conditions that caused this code to set are not present
at this time. Using the wiring diagram/schematic as a guide,
inspect the wiring and connectors.
Perform BODY VERIFICATION TEST – VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
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HEATED SEATS - ELECTRICAL DIAGNOSTICS
LX
U0019–CAN B BUS – HSM
For a complete wiring diagram Refer to Section 8W.
LX
HEATED SEATS - ELECTRICAL DIAGNOSTICS
8G - 67
•
When Monitored:
Continuously
•
Set Condition:
Whenever the Can B Bus (+) or B Bus (–) circuit is open, shorted to voltage or shorted to ground, this code
will set.
Possible Causes
CAN B BUS DTC’s IN FRONT CONTROL MODULE
(D54) CAN B BUS (–) CIRCUIT OPEN
(D55) CAN B BUS (+) CIRCUIT OPEN
HEATED SEAT MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase DTC’s
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read DTC’s.
Does the scan tool display U0019 CAN B BUS CIRCUIT?
Yes
>> Go To 2
No
>> The conditions that caused this code to set are not present
at this time. Using the wiring diagram/schematic as a guide,
inspect the wiring and connectors.
2.
CHECK FRONT CONTROL MODULE DTC’s
With the scan tool, read Front Control Module DTC’s
Does the scan tool display any CAN B BUS DTC’s – ACTIVE?
Yes
>> Refer to the symptom list for problems related to Communication in the ELECTRICAL.– ELECTRONIC
CONTROL MODULES – ELECTRICAL DIAGNOSES section.
No
>> Go to 3
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HEATED SEATS - ELECTRICAL DIAGNOSTICS
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3.
CAN B BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the Heated Seat Module connector.
Disconnect the Front Control Module C1 connector.
Measure the resistance of the (D55) Can B Bus (+) circuit between the
Front Control Module C1 connector and the Heated Seat Module con-
nector.
Is the resistance below 2.0 ohms?
Yes
>> Go To 4
No
>> Repair the Can B Bus (+) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
4.
CAN B BUS (–) CIRCUIT OPEN
Measure the resistance of the (D54) Can B Bus (–) circuit between the
Front Control Module C1 connector and the Heated Seat Module con-
nector.
Is the resistance below 2.0 ohms?
Yes
>> Replace the Heated Seat Module.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
No
>> Repair the Can B Bus (–) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
LX
HEATED SEATS - ELECTRICAL DIAGNOSTICS
8G - 69
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